CN102590646A - Method for detecting positive sequence, negative sequence and harmonic current based on phase sequence filter - Google Patents
Method for detecting positive sequence, negative sequence and harmonic current based on phase sequence filter Download PDFInfo
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- CN102590646A CN102590646A CN2012100327601A CN201210032760A CN102590646A CN 102590646 A CN102590646 A CN 102590646A CN 2012100327601 A CN2012100327601 A CN 2012100327601A CN 201210032760 A CN201210032760 A CN 201210032760A CN 102590646 A CN102590646 A CN 102590646A
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Abstract
The invention discloses a method for detecting a positive sequence, a negative sequence and harmonic current based on a phase sequence filter. The method includes the following steps: three-phase load current value is detected, and the current value is converted to under a two-phase static coordinate; a positive and negative sequence fundamental filter performs digital filtering on axis current component under the two-phase static coordinate to obtain axis-axis positive and negative sequence fundamental current component; the axis-axis positive and negative sequence fundamental current component is converted to under a three-phase static coordinate to obtain three-phase positive and negative sequence fundamental current component; and finally the thee-phase load current value subtracts the three-phase positive and negative sequence fundamental current component to obtain harmonic component. The method dose not need to obtain reactive power value and a synchronous rotation angle, and has no rotation transformation of the coordinates.
Description
Technical field
The present invention relates to a kind of detection technique, particularly a kind of positive sequence, negative phase-sequence and harmonic current detecting method based on sequence filter.
Background technology
Along with the develop rapidly of Power Electronic Technique, various device for power switching and other nonlinear loads are extensively adopted at industrial circle, have brought facility for the conversion application of electric energy, and have improved the efficient of conversion; They cause harmonic wave to be injected electrical network in large quantities again on the other hand, cause electric pollution.Using active filter to solve harmonic problem is the most frequently used method.Active Power Filter-APF also is a kind of power electronic equipment; Its ultimate principle is from target compensation, to detect harmonic current; Produce one with this harmonic current equal and opposite in direction and opposite polarity offset current only contains fundametal compoment thereby make in the power network current by compensation system.
At present, the harmonic current detecting method that is applied to active filter mainly contains fourier transform method, based on the p-q converter technique and the i of instantaneous reactive power theory
p-i
qConverter technique.Fourier transform method is based on the analysis to cycle data, and calculated amount is big, is unwell to quick real-time control; Patent " positive sequence of electric power system, negative phase-sequence, idle and harmonic current detecting method " all is based on instantaneous reactive power theory with " a kind of harmonic wave and reactive current detection method based on spatial transformation of voltage vectors "; Need carry out conversion to obtain the vector space positions angle to three-phase voltage; Thereby increased the complicacy of harmonic wave detection algorithm and, brought delay time error inevitably the dependence of voltage.
Summary of the invention
The objective of the invention is provides a kind of positive sequence based on sequence filter, negative phase-sequence and harmonic current detecting method to the defective that prior art exists, and this method is less to the voltage detecting dependence, need not phaselocked loop (PLL) and obtains synchronous rotation angle.Need detect the line voltage fundamental frequency in order to obtain quite good detecting effectiveness, the detection of fundamental frequency rotation angle relatively synchronously is easy to realize and do not exist delay time error.
Technical solution of the present invention is following:
A kind of positive sequence based on sequence filter, negative phase-sequence and harmonic current detecting method may further comprise the steps:
Step 1: from current detection circuit, record threephase load electric current
,
,
, decompose and can obtain by symmetrical component method:
Where,
is the fundamental angular frequency,
,
are the currents corresponding
harmonic positive sequence, negative sequence component of the RMS;
,
are
harmonic positive and negative sequence component of the phase angle.
Step 2: with
;
;
carries out three phase static
coordinate to two mutually static
coordinate transform; Obtain biphase current
,
;
, algorithm is following:
;
Step 3: Read from the storage registers were fundamental positive sequence filter and negative sequence fundamental output of the previous filter
,
and
,
.
Step 4: The two-phase current
,
subtracting the negative sequence fundamental previous filter output result
,
derived from the fundamental difference between positive sequence filter filtering through to get the current two-phase positive sequence fundamental current
,
component; same time, the two-phase current
,
subtracting the fundamental positive sequence filter the output of the previous results
,
draw negative sequence fundamental difference filter filtering through to get the current two-phase negative sequence fundamental current
,
weight.
Step 5: The fundamental positive sequence current filter output two-phase positive sequence fundamental current
,
weight assigned to the
,
corresponding storage registers; also negative sequence fundamental to the current output of the two-phase filter negative sequence fundamental current
,
component assigned to the
,
corresponding storage register.
Step 6: with two phase positive sequence fundamental currents
,
with two mutually the result that draws of negative phase-sequence fundamental current
,
addition carry out two mutually static
coordinate to three phase static
coordinate transform; Obtain fundametal compoment
,
,
in the three-phase current, the algorithm of coordinate transform is: two mutually static
coordinate is the inverse operation of three phase static
coordinate to two mutually static
coordinate transform to the algorithm of three phase static
coordinate transform;
The transport function of the positive sequence first-harmonic wave filter that adopts in the said step 3 is:
In the formula;
is the first-harmonic angular frequency of line voltage, and
is the bandwidth of positive sequence wave filter.
The transport function of negative phase-sequence first-harmonic wave filter is:
In the formula;
is the first-harmonic angular frequency of line voltage, and
is the bandwidth of negative phase-sequence wave filter.
The first-harmonic angular frequency of line voltage in said positive sequence wave filter and the negative phase-sequence wave filter
is detected the A phase voltage by frequency detection circuit and obtains.
The present invention compared with prior art; Have following conspicuous outstanding substantive distinguishing features and marked improvement: the positive sequence, negative phase-sequence and the harmonic current detecting method that the present invention is based on sequence filter; Need not to try to achieve reactive power value and synchronous rotation angle, and do not have the rotational transform of coordinate.Therefore, simple in structure, calculated amount is less, is easy to Project Realization, exists under the distortion situation at line voltage also can obtain quite good detecting effectiveness.
Description of drawings
Fig. 1 is positive sequence of the present invention, negative phase-sequence and harmonic current detecting method schematic diagram;
Fig. 2 is positive sequence first-harmonic Filter Structures block diagram under the present invention two mutually static
coordinate system;
Concrete implementation
Below combination figure and practical implementation process are explained further details to the present invention:
As shown in Figure 1 the positive sequence based on sequence filter, negative phase-sequence and harmonic current detect schematic diagram; Comprise three-phase current detection circuit 1; A phase voltage frequency detection circuit 2; Three phase static
coordinate to two mutually static
coordinate transform 3; Positive sequence first-harmonic wave filter 5; Negative phase-sequence first-harmonic wave filter 6; Storage register 8; Two mutually static
coordinate is to 4,10 and totalizers 7 of 9, two subtracters of three phase static
coordinate transform.
This is based on positive sequence, negative phase-sequence and the harmonic current detecting method of sequence filter, and its controlled step is following:
Step 1: detect threephase load electric current
by three-phase current detection circuit;
;
; Wherein can be according to symmetrical component method to threephase load electric current
;
,
is decomposed into:
Where,
is the fundamental angular frequency,
,
are the currents corresponding
harmonic positive sequence, negative sequence component of the RMS;
,
are
harmonic positive and negative sequence component of the phase angle.
Step 2: will detect by three-phase current detection circuit and obtain threephase load electric current
;
;
carries out three phase static
coordinate to two-phase static
transformation of coordinates algorithm; Obtain biphase current
,
Where three-phase static
coordinates to a two-phase stationary
coordinate transformation algorithm is as follows:
Step 3: Read from the storage registers were fundamental positive sequence filter and negative sequence fundamental output of the previous filter
,
and
,
.
Step 4: After a three-phase static
coordinates to a two-phase stationary
coordinate transformation resulting two-phase current
,
subtracting the negative sequence fundamental previous filter output result
,
derived from the fundamental difference between the input to the positive sequence filter filtering to obtain the current two-phase positive sequence fundamental current
,
component; Meanwhile, the two-phase current
,
subtracting the fundamental positive sequence filter the output of the previous results
,
resulting negative sequence fundamental difference between the input filter to get the current two-phase filtering negative sequence fundamental current
,
weight.
Step 5: The fundamental positive sequence current filter output two-phase positive sequence fundamental current
,
weight assigned to the
,
corresponding storage registers; also negative sequence fundamental to the current output of the two-phase filter negative sequence fundamental current
,
component assigned to the
,
corresponding storage register.
Step 6: will by step 4 obtain two phase positive sequence fundamental currents
,
with two mutually the result after negative phase-sequence fundamental current
,
addition carry out two mutually static
coordinate to three phase static
coordinate transform; Thereby obtain fundametal compoment
,
,
in the three-phase current; Wherein two mutually static
coordinate is the inverse operation of three phase static
coordinate to two mutually static
coordinate transform to the algorithm of three phase static
coordinate transform, and is as follows:
Fig. 2 is respectively positive sequence first-harmonic wave filter and negative phase-sequence first-harmonic Filter Structures block diagram under two mutually static
coordinate system with Fig. 3.Positive sequence first-harmonic wave filter and negative phase-sequence first-harmonic wave filter that the present invention proposes are a kind of digital filters that adopts the complex coefficient transport function, can extract positive-sequence component and negative sequence component in the threephase load electric current respectively.Fundamental positive sequence filter
and negative sequence fundamental filters
The transfer functions are as follows:
In the formula;
is the first-harmonic angular frequency of line voltage, and
is the bandwidth of wave filter.
Wherein the first-harmonic angular frequency of line voltage
detects acquisition by A phase voltage frequency detection circuit to the A phase voltage in positive sequence wave filter and the negative phase-sequence wave filter.
Can obtain by formula 5 and formula 6:
Above two formulas can be rewritten into respectively:
So can get positive sequence first-harmonic wave filter and the structured flowchart of negative phase-sequence first-harmonic wave filter under two mutually static
coordinate system according to formula 9, formula 10, respectively as shown in Figures 2 and 3.
Above content is to combine concrete preferred implementation to further explain that the present invention did; Can not assert that embodiment of the present invention only limits to this; Those of ordinary skill for technical field under the present invention; Under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to the present invention and confirm scope of patent protection by claims of being submitted to.
Claims (3)
1. the positive sequence based on sequence filter, negative phase-sequence and harmonic current detecting method is characterized in that: may further comprise the steps:
Step 1: from current detection circuit, record threephase load electric current
,
,
, decompose and can obtain by symmetrical component method:
Where,
is the fundamental angular frequency,
,
are the currents corresponding
harmonic positive sequence, negative sequence component of the RMS;
,
are
harmonic positive and negative sequence component of the phase angle;
Step 2: with
;
;
carries out three phase static
coordinate to two mutually static
coordinate transform; Obtain biphase current
,
;
, algorithm is following:
Step 3: were read from the storage registers fundamental positive sequence and negative sequence fundamental filters filter the output of the previous
,
and
,
;
Step 4: The two-phase current
,
subtracting the negative sequence fundamental previous filter output result
,
After a positive sequence derived from the difference Fundamental filter filter to get the current two-phase positive sequence fundamental current
,
component; Meanwhile, the two-phase current
,
subtracting the fundamental positive sequence previous filter output result
,
draw negative sequence fundamental difference filter filtering through to get the current two-phase negative sequence fundamental current
,
component;
Step 5: The fundamental positive sequence current filter output two-phase positive sequence fundamental current
,
weight assigned to the
,
corresponding storage registers; At the same time, will also be fundamental negative sequence current filter output two-phase negative sequence fundamental current
,
weight assigned to the
,
corresponding storage registers;
Step 6: with two phase positive sequence fundamental currents
,
with two mutually the result that draws of negative phase-sequence fundamental current
,
addition carry out two mutually static
coordinate to three phase static
coordinate transform; Obtain fundametal compoment
,
,
in the three-phase current, the algorithm of coordinate transform is: two mutually static
coordinate is the inverse operation of three phase static
coordinate to two mutually static
coordinate transform to the algorithm of three phase static
coordinate transform;
2. a kind of positive sequence based on sequence filter according to claim 1, negative phase-sequence and harmonic current detecting method is characterized in that: the transport function of the positive sequence first-harmonic wave filter that adopts in the said step 3 is:
In the formula;
is the first-harmonic angular frequency of line voltage, and
is the bandwidth of positive sequence wave filter;
The transport function of negative phase-sequence first-harmonic wave filter is:
3. a kind of positive sequence based on sequence filter according to claim 2, negative phase-sequence and harmonic current detecting method is characterized in that: the first-harmonic angular frequency of line voltage in said positive sequence wave filter and the negative phase-sequence wave filter
is detected the A phase voltage by frequency detection circuit and obtains.
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Application publication date: 20120718 |